revert: 撤回登录相关鉴权改动，恢复星阙原登录逻辑

UFO 登录问题应只在前端处理（登录请求不带旧 Token），不应改共享后端登录接口。

Co-authored-by: Cursor <cursoragent@cursor.com>

users/views/auth.py

@@ -103,13 +103,8 @@ class WechatMiniProgramLoginView(APIView):
     """
     微信小程序登录接口
     """
-    authentication_classes = ()
-    permission_classes = ()
-    throttle_classes = ()
-
-    def initial(self, request, *args, **kwargs):
-        # 与 /jituan/auth/wechat-login 一致：登录绝不走 JWT，避免 403「权限不足」
-        return
+    throttle_classes = [AnonRateThrottle]
+    permission_classes = [AllowAny]
 
     def post(self, request):
         try: